Lombardo Luca, Arreghini Angela, Maccarrone Roberta, Bianchi Anna, Scalia Santo, Siciliani Giuseppe
Postgraduate School of Orthodontics, University of Ferrara, Via Montebello 31, 44100, Ferrara, Italy.
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara 17/19, 44121, Ferrara, Italy.
Prog Orthod. 2015;16:41. doi: 10.1186/s40510-015-0111-z. Epub 2015 Nov 18.
The aim was to assess and compare absorbance and transmittance values of three types of clear orthodontic aligners before and after two cycles of in vitro aging.
Nine samples of orthodontic aligners from three different manufacturers (Invisalign, Align Technology, Santa Clara, CA, USA; All-In, Micerium, Avegno, GE, Italy; F22 Aligner, Sweden & Martina, Due Carrare, PD, Italy) were selected, and each sample was subjected to spectrophotometry analysis of both its transmittance and absorbance a total of 27 times. Samples were subsequently aged in vitro at a constant temperature in artificial saliva supplemented with food colouring for two cycles of 14 days each. The spectrophotometry protocol was then repeated, and the resulting data were analysed and compared by means of ANOVA (p < 0.05).
All types of aligners tested yielded lower transmittance and higher absorbance values after aging, but the difference was not significant in any case. That being said, the F22 aligners were found to be most transparent, both before and after aging, followed by Invisalign and All-In, and these differences were statistically significant.
Commercial aligners possess significantly different optical, and therefore aesthetic, properties, both as delivered and following aging.
目的是评估和比较三种类型的透明正畸矫治器在体外老化两个周期前后的吸光度和透光率值。
从三个不同制造商（美国加利福尼亚州圣克拉拉市隐适美公司；意大利热那亚阿韦尼奥市米塞里姆公司的全隐形矫治器；意大利帕多瓦省杜卡拉雷市瑞典&玛蒂娜公司的F22矫治器）选取九个正畸矫治器样本，每个样本进行27次透光率和吸光度的分光光度法分析。随后，样本在添加食用色素的人工唾液中恒温进行体外老化，每个周期为14天，共两个周期。然后重复分光光度法检测方案，并通过方差分析（p < 0.05）对所得数据进行分析和比较。
所有测试类型的矫治器在老化后透光率均降低，吸光度均升高，但在任何情况下差异均无统计学意义。尽管如此，发现F22矫治器在老化前后都是最透明的，其次是隐适美和全隐形矫治器，这些差异具有统计学意义。
市售矫治器在交付时以及老化后的光学性能（因此美学性能）存在显著差异。
